Pulp molded product and method for manufacturing same

Abstract

A molded pulp product including: a pulp, a water- and oil-resistant agent, and a water soluble polymer that does not dissolve in an aqueous medium at 40° C. or lower, wherein a content of the water soluble polymer is 1 to 50% by mass, based on the pulp.

The invention claimed is: 
     
       1. A molded pulp product comprising:
 a pulp, 
 a water- and oil-resistant agent, and 
 a water soluble polymer that does not dissolve in an aqueous medium at 40° C. or lower, 
 wherein the water- and oil-resistant agent comprises a fluorine-containing copolymer comprising repeating units derived from: 
 (a) a fluorine-containing monomer represented by general formula:
   CH 2 ═C(—X)—C(═O)—Y—Z—Rf  (1)
 
 wherein
 X is a hydrogen atom, a monovalent organic group, or a halogen atom, 
 Y is —O— or —NH—, 
 Z is a direct bond or a divalent organic group, and 
 Rf is a fluoroalkyl group having 1 to 6 carbon atoms; and 
 
 
 (b) a monomer having at least one of an anion donating group and a cation donating group; and 
 wherein the water soluble polymer comprises starch having a cation site, and wherein 
 a content of the water soluble polymer is 1 to 50% by mass, based on the pulp. 
 
     
     
       2. The molded pulp product according to  claim 1 , wherein the water soluble polymer comprises a starch powder. 
     
     
       3. The molded pulp product according to  claim 1 , wherein a content of the water- and oil-resistant agent is 0.01 to 20% by mass, based on the pulp. 
     
     
       4. The molded pulp product according to  claim 1 , wherein in general formula (1),
 X is a hydrogen atom, a linear or branched alkyl group having 1 to 21 carbon atoms, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a CFX 1 X 2  group (wherein X 1  and X 2  are each independently a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom), a cyano group, a linear or branched fluoroalkyl group having 1 to 21 carbon atoms, a substituted or unsubstituted benzyl group, or a substituted or unsubstituted phenyl group, 
 Z is a direct bond, an aliphatic group having 1 to 10 carbon atoms, an aromatic group or cycloaliphatic group having 6 to 18 carbon atoms, a —CH 2 CH 2 N(R 1 )SO 2 — group (wherein R 1  is an alkyl group having 1 to 4 carbon atoms), a —CH 2 CH(OZ 1 )CH 2 — group (wherein Z 1  is a hydrogen atom or an acetyl group), or a —(CH 2 ) m —SO 2 —(CH 2 ) n — group or —(CH 2 ) m —S—(CH 2 ) n — group (wherein m is 1 to 10, and n is 0 to 10), and 
 Rf is a fluoroalkyl group having 1 to 6 carbon atoms. 
 
     
     
       5. The molded pulp product according to  claim 1 , further comprising a cationic coagulant. 
     
     
       6. The molded pulp product according to  claim 1 , further comprising a water-resistant agent in addition to the water- and oil-resistant agent. 
     
     
       7. The molded pulp product according to  claim 1 , having an air permeance of 500 seconds or more. 
     
     
       8. The molded pulp product according to  claim 1 , which is a food container. 
     
     
       9. The molded pulp product according to  claim 1 , wherein Rf is a perfluoroalkyl group having 1 to 6 carbon atoms.